OBD-II code · Chassis
C0668 Right Rear Wheel Speed Sensor B Circuit Low
Right Rear Wheel Speed Sensor B Circuit Low: the signal voltage is below the expected range. Wheel-speed signals feed ABS, ESC, traction control and the speedometer.
Is it safe to drive with C0668?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Rr Wss B
Related codes
- C0514Right Rear Wheel Speed Sensor A Circuit Low
- C0665Left Rear Wheel Speed Sensor B Incorrect Component Installed
- C0666Right Rear Wheel Speed Sensor B Circuit/Open
- C0667Right Rear Wheel Speed Sensor B Range/Performance
- C0669Right Rear Wheel Speed Sensor B Circuit High
- C066ARight Rear Wheel Speed Sensor B Intermittent/Erratic
- C066BRight Rear Wheel Speed Sensor B Correlation
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.